Derrick.



J. MGMYLER.

DERRIGK.

PPLIGATION FILED 1320.5, 1904.

901,461. Patented oct..2o,19os.

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PETERS co. wAsmNm'oN. nA c4 J. MoMYLBR.

APPLICATION FILED DBO. 6,1904.

Patented Oct. 20, 1908.

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vUNITED sTATEs PATENT onirica.

JOHN MCMYLER, OF CLEVELAND, OHIO7 ASSIGNOR TO THE MCMYLER MANFACTURING COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

DERRICK.

Specification of Letters Patent.

Patented Oct. 20, 1908.

Application filed December 5, 1904. Serial No. 235,456.

To all whom it may concern:

Be it known that I, JOHN MCMYLER, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Derricks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

The improved derrick constituting this invention is especially useful when used in connection with clam shell buckets for unloading ore boats.

The primary object of the invention is to provide a derrick with which the bucket may be lowered for loading at any point between thesides of the vessel, whereby a very large part of the cargo may be automatically picked up without being shoveled or scraped to a position beneath the bucket. The. described derrick has this capacity, and it has the additional capacity for dumping the bucket at various distances from the dock front.

The invention consists first in the combination of a derrick frame, with a sliding boom mounted thereon and carrying guide sheaves for the bucket ropes, and mechanism for sliding said boom in and out as required.

It also consists in the combination of parts mentioned when supported on a whirling platform which also carries the motor and winding drums by which to take in and pay out the bucket ropes and the ropes by which the boom is moved.

It also consists in certain more specific combinations of parts, all of which will be hereinafter described and pointed out definitely in the claims.

In the drawing Figure 1 is a side elevation of a derrick embodying my invention; and F ig. 2 is a view, from the right side of F ig. 1 of the derrick frame and boom, above the line 2 2 of Fig. 1,-showing also the rollers and sheaves mounted thereon.

Referring to the parts by letters, A represents a whirling platform,-that is to say a platform capable of being turned about a vertical axis. The mechanism for turning it is not shown because it is no part of the present invention and because mechanism'for this purpose is common in the art, and any suitable mechanism may be employed when the derrick frame and other parts are supported upon whirling platform. This platform is shown as mounted on a wheel truck, but that is a detail which is immaterial to the present invention.

A derrick frame B is erected upon the platform A. This frame may consist of two similar sections erected at lthe sides of the platform, each section consisting of an upright b, a forwardly extended inclined member b, a substantially horizontal member b2, which connects the upper ends of the members b and b, and other members, as b3, b4, which give strength and rigidity. The two side sections are connected by suitable transverse members b5 to make a rigid frame. Of course the details of this frame may be varied at will, it being only necessary that the frame be adapted to support the sliding boom and the associated parts substantially as hereinafter described.

C represents a sliding boom, which may be made of two parallel bars c, c, and suitable transverse connecting members c. This boom rests upon two pairs of rollers, to wit, the rollers D, D, which are mounted on the inner sides of the two upright members l), and two rollers E, E, which are mounted upon the inner sides of the members b. Two other rollers F, Il, are mounted on the inner sides of the members o. These latter rollers F, F, and the force of gravity will hold the boom upon the guiding and supporting-rollers D and E. l

In the outer end of the boom the three sheaves G, G', G2 are mounted; and over these pass the ropes g, g', g2 which support the bucket H. These ropes go inward over sheaves J, J J 2, mounted on the boom, then around sheaves K, K, K, mounted on the frame and thence to power operated winding drums on the platform A. The ropes are carried over the sheaves J, J J 2 in order that the weight of the bucket may assist in moving the boom outward.

The boom is moved outward by means of two ropes M, M, secured to its sides, and extending around sheaves m, m, mounted on its sides, thence over sheaves m mounted on the frame B down to the power operated winding drum P. The boom is moved inward by ropes N, N, secured to its sides which extend outward around the sheaves a, n, mounted on the sides of the boom, and

thence around sheaves n', n', mounted onv frame B, down to the same winding drum P,-on which they are wound in the opposite direction to ropes h/I, El.

It is clear that by moving the boom the bucket may be lowered from any position between the two extreme positions indicated by full and dotted lines in Fig l. And it is likewise Vclear that by turning the platform and moving the boom the bucket may be dumped at any desired point within the limits of the booms movements.

Having described my invention, l claim:

l. The combination of a derrick frame, a sliding` boom mounted thereon, ropes attached to said boom and passing over sheaves on the derrick frame, means for taking` in and paying out said ropes, sheaves adapted to receive load supporting` ropes at the end of the boom, guiding sheaves for said loadsupporting ropes mounted intermediate the ends of the boom, and sheaves on the derrick frame adapted to receive the load-supporting` ropes, said last mentioned sheaves being positioned so as to be nearer the outer end of the boom than the aforementioned sheaves which are mounted on the boom between the ends thereof and load-supporting ropes attached to a drum and passing over the sheaves on the derrick frame above mentioned as adapted to receive the same, and reeved about the said sheaves on the boom intermediate the ends thereof, and over and depending from the sheaves at the outer end of the boom, whereby the weight of a load may assist in moving the boom forward.

2. The combination of a derrick frame, a sliding boom mounted thereon, means for moving` said boom backward and forward, sheaves at the outer end of the boom, sheaves intermediate the ends of the boom, sheaves on the derrick frame intermediate the above mentioned sets of sheaves, an operating drum, ropes passingl over the sheaves on the outer ends of the boom and dependingl directly therefrom and a load supported by said ropes, said ropes passing` backward around the sheaves on the boom intermediate the ends thereof and then passing forward and around said sheaves 0n the derrick to the operating drum.

In testimony whereof, I hereunto aiiiX my signature in the presence of two witnesses. JHN MCMYLER. 1Witnesses E. L. THURs'roN, ALBERT H. BATES. 

